Regulator Says Its Worst-Case Economic Scenario Would Force More Significant Government Support

Fannie Mae and Freddie Mac could require another $190 billion in government support under a worst-case economic scenario, according to stress test results made public Wednesday by the firms' federal regulator.

The stress tests, mandated by the Dodd-Frank financial-regulatory overhaul, are designed to forecast potential losses in a "severely adverse" economic environment. The projections released Wednesday by the Federal...